Speed control device



April 26, 1949. T. ELLEMAN SPEED CONTROL DEVICE 2 Sheets-Sheet 1 Filed Aug. 12, 1946 INVENTOR. 76m El/eman Patented Apr. 26, 1949 UNITED STATES PATENT OFFICE SPEED CONTROL DEVICE Claims.

This invention relates to a speed control device, especially to speed control means for a utility internal combustion engine such as is disclosed in patent application Serial Number 601,985 filed June 28, 1945, and assigned to the assignee of this invention.

t is an object of this invention to provide a speed control device for a utility power plant which permits the selection of a desired operating speed. This is accomplished by the use of indications on a plate mounted to cooperate with a selector which is connected to vary the tension on a spring, the spring in turn being connected to the speed responsive device which controls the engine throttle. Other objects will be apparent from a study of the description of the invention.

In the drawings:

Fig. 1 is a top plan view of a portion of an engine showing the invention. The indicator plate is broken away in this view.

Fig. 2 is a side elevation view of a portion of an engine embodying the invention.

Fig. 3 is a top plan View of an engine equipped with a hood and showing the indicator plate in relation to the hood and Fig. i is a view in elevation showing another embodiment of the invention.

Referring now to the drawings in detail a throttle valve actuating member 2 is shown connected to a governor arm ll through a substantially rigid connection 6. Governor arm 4 is pivoted at 8 and is biased toward one end of its travel by means of spring i0. Spring 10 is connected at its end 12 to the governor arm and is provided with a movable anchor 14 for its other end. A selector I6 having a pointer or indicator I8 is mounted on spindle 20 and carries an arm 22 which is adapted to receive the movable anchor M.

A choke valve actuator 2 is biased in one direction by means of a spring (not shown) in the housing 28. Choke valve actuator 24 may be moved against its spring bias by means of the rigid connector 28 which is movable in an opening 3!! in plate 32. At its right end as seen in Figures 1 and 2, connection 28 abuts against an arm 34 which is secured to and moved by spindle 20. As seen in Figure 1 counterclockwise rotation of the selector l6 actuates the connector 28 to choke the engine. Selector i5 is shown in the choke position in Figures 1 and 2.

An indicator plate 35 is mounted to cooperate with the indicator point Id of selector [5. Plate 35 is best shown in Figure 3 where it appears through an opening 38 in the hood 39. The hood 39 is substantially the same as that shown in Patent Number 2,410,142. Carrying handles 40 on the engine protrude through the opening 38 in the hood. A screen 4| for the passage of cooling air is shown disposed between the handles. Plate 36 is provided with a substantially circular opening to accommodate a stop button 42 which will be connected in the ignition system in such a way as to permit disconnecting the ignition by pressing the stop button. The selector and indicator are not shown in Figure 3. However, the indicator point it of selector H5 is positioned to cooperate with the semicircular dial 44 which provides use indications for normal engine operation. An additional indication for the choke position of the selector and indicator is shown at 46. As can be seen from Figure 3, the choke indication is away from and independent of the normal use indications 46. To choke the engine the selector is turned so that indicator I8 points to the choke position of the indicator plate.

The term use indications here means indicia or markings indicating the conditions under which the engine will operate. Thus, with the pointer set at 1 horsepower, the engine drives the Hi take-off shaft at approximately 1200 R. P. M., the Medium shaft at 600 R. P. M., and the Lo shaft at 300 R. P. M.

In Figure 4 is shown another embodiment of the invention in which spring 10 is connected to be put under varying tension by means of cord 48 wound about spindle 20 and anchored in arm 50.

Operation In operation selector [6 will be turned so that indicator I8 is on the normal use indications dial M and points to the choke position 46. With the engine running, the selector I6 is then turned clockwise so that indicator It points to the desired operating or use conditions indicated on dial 44. Rotation of selector It varys the tension in spring 50 and changes the operating characteristics of the governor which controls arm 4.

I claim:

1. In an internal combustion engine, a throttle actuating member, a movable governor arm, a connection from the governor arm to the throttle actuating member, a spring connected at one end to bias the governor arm toward one extreme of its travel, a movable anchor for the other end of the spring, a plate having a plurality of use indications thereon, an indicator positioned to select a use indication and connected to move the spring anchor to accord with the various use indications, a choke valve actuating arm, and

means to operate the choke valve actuating arm by movement of the indicator.

2. The invention of claim 1, in which the lastnamed means operates the choke valve positively by movement of the indicator in one direction only.

3. The invention of claim 1, in which the use indications for normal operation include engine horsepower and power take-off R. P. M. indications.

4. In an interna1 combustion engine, a throttle actuator, a movable governor arm connected to operate the throttle actuator, a spring connected at one end to the governor arm, a movable anchor for the other end of the spring, a selector connected to move the anchor to accord with the operating conditions of the engine, a choke valve actuator, a connection to permit the selector to operate the choke valve in one direction, the position of the selector to choke the engine being difierent from any selector position for normal operation of the engine.

5. In an internal combustion engine, a throttle actuating member, a governor arm, a connection from the governor arm to the throttle actuating member, a spring connected at one end to bias the governor arm toward one extreme of its travel, a movable anchor for the other end of the spring, an indicator plate having indications thereon, an indicator movable to a selected indication, means actuable by the indicator to vary the position of the anchor, a choke valve actuating arm, and a member controlled by the indicator and actuable to move the choke arm in one direction.

TOM

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date Hinkley Jan. 23, 1923 Maier et al. July 9, 1929 Altman Oct. 29, 1946 Number 

